Ferdinand I was Prince of Bulgaria from 1887 to 1908 and Tsar of Bulgaria from 1908 until his abdication in 1918. Under his rule Bulgaria entered the First World War on the side of the Central Powers in 1915.
Ferdinand in 1912
Ferdinand in Bulgarian Field Marshal's uniform 1941
The Nine Sovereigns at Windsor for the funeral of King Edward VII, photographed on 20 May 1910. Standing, from left to right: King Haakon VII of Norway, Tsar Ferdinand of the Bulgarians, King Manuel II of Portugal and the Algarve, Kaiser Wilhelm II of Germany and Prussia, King George I of the Hellenes and King Albert I of the Belgians. Seated, from left to right: King Alfonso XIII of Spain, King George V of the United Kingdom and King Frederick VIII of Denmark.
Emperor Wilhelm and Tsar Ferdinand in Sofia, 1916
Bulgaria during World War I
The Kingdom of Bulgaria participated in World War I on the side of the Central Powers from 14 October 1915, when the country declared war on Serbia, until 30 September 1918, when the Armistice of Salonica came into effect.
A German postcard commemorating the entry of Bulgaria into the war.
Territorial changes following the two Balkan Wars.
A Punch cartoon of the Second Balkan War.
Vasil Radoslavov (c.1915). Prime minister from 1913 to 1918.